Stretchable film and product including same

A stretchable film, comprising:

• an olefin-based resin which is an olefin-based elastomer, a non-elastomeric olefin-based resin, or a blend of an olefin-based elastomer, and a non-elastomeric olefin-based resin;
• and
• a filler,
• wherein the stretchable film is formed of a laminate of three layers, the laminate having a layer construction of “layer A/layer B/layer C”,
• wherein each of layer A, layer B, and layer C comprises the olefin-based elastomer and each of layer A and layer C comprises the non-elastomeric olefin-based resin,
• wherein the olefin-based elastomer of the layer B comprises an amorphous polypropylene and the layer B is free of a any non-elastomeric olefin-based resin,
• wherein the content of the olefin-based elastomer in the olefin-based resin is from 20 wt. % to 30 wt. % in each of layer A and layer C,
• wherein the content of the non-elastomeric olefin-based resin in the olefin-based resin is from 70 wt. % to 80 wt. % in each of layer A and layer C,
• wherein the content of the filler in each of layer A, layer B, and layer C is 50 parts by weight or more with respect to 100 parts by weight of the olefin-based resin in each of layer A, layer B, and layer C in the stretchable film,
• wherein stretching of the stretchable film produces voids in a surface thereof,
• wherein the stretchable film is obtained by subjecting an unstretched film to a stretching treatment, wherein the unstretched film is stretched in at least one direction to a degree of 3.5 times or more and less than 4.5 times, and
• wherein the air permeability is 429 sec/100 cc to 1211 sec/100 cc when extended twice in its transverse direction.